Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441111a&link_type=abstract
American Astronomical Society, AAS Meeting #214, #411.11; Bulletin of the American Astronomical Society, Vol. 41, p.677
Astronomy and Astrophysics
Astronomy
Scientific paper
Uncertainties in the fundamental parameters of the nearest and best-studied luminous stars stem in part from uncertainties in their measured annual parallaxes. There are 4806 stars with V < 6, unobservable by the GAIA mission due to brightness, which also have Hipparcos parallaxes with greater than 1% uncertainties. Among these stars are many with measured angular diameters from optical long-baseline interferometry. SIM, promising 1% distances to 2500 pc, will provide the parallaxes needed to convert these stars' angular diameters into a physical radii with uncertainties as low as 1%. The error box of these single stars in the H-R diagram is then limited by the absolute calibration of the photometry or, for very hot stars, the inability to observe the spectral energy distribution into the far ultraviolet. We summarize the prospects for constraining the fundamental parameters of stars that only SIM can observe.
Aufdenberg Jason Paul
Ridgway Stephen T.
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